Need diagrams of 4 belt system 1987 chevy 350

It is possible to upgrade a 1987 Chevy 350 engine to a serpentine belt assembly using parts from a 1994 Chevy small block engine. However, there are some differences between the two engines that may affect compatibility.
One major difference between the two engines is the placement of the alternator. On the 1987 engine, the alternator is typically mounted on the driver's side of the engine. On the 1994 engine, the alternator is typically mounted on the passenger's side of the engine. This means that the brackets and pulleys for the serpentine belt assembly may be different between the two engines.
Another factor to consider is the number of pulleys on the serpentine belt assembly. Some 1994 small block engines were equipped with additional accessories, such as air conditioning or power steering, that require extra pulleys. If your 1987 engine does not have these accessories, you may need to modify the serpentine belt assembly to remove the extra pulleys.
To ensure that the serpentine belt assembly from the 1994 engine will fit your 1987 engine, it is recommended that you compare the parts and brackets from both engines side by side to identify any differences.

A 350 ci is a v8, 5.7L. What's with the 3.8L? The picture is for 350 ci--5.7L. Hope it helps?

T_330_81_1981_Chevrolet_Light_Duty_Truck_10_to_30_Service_Manual
http://www.73-87chevytrucks.com/techinfo/7387CKMans//Service/ST_330_81_1981_Chevrolet_Light_Duty_Truck_10_to_30_Service_Manual.pdf

GMC Workshop Manuals

www.ask.com/v-belt/diagram/layout/1977/chevy/winnabago/350/cubic-inches/with/air-condition/

buy a repair manual for 1987 chevy celebrity. Pepboys, Oreilly, etc.

Look for something like this either stuck under the hood or on the fan shroud

have you try ed looking under hood? if not located under hood check door jamb . if that don't reveal anything of help go to a parts store and ask them to print out a diagram. If that don't work find a van the same year as your motor home and most likely the belts will be ran the same way. you may need to go to a junk yard to find it.

For the 1987 Chevrolet Blazer 350 (5.7L):

Firing Order:
1-8-4-3-6-5-7-2

Cylinders:
.......(back)........
|..8..............7..|
|..6..............5..|
|..4..............3..|
|..2..............1..|
........(front)

Distributor Connections:
.....(back)
.....6.....5
3...............7
4...............2
.....8.....1
.....(front)
Rotation:
Clockwise

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

My sincere apologies for the delayed response.
I am personally going back to answer your unanswered questions.

I do not know if you still need this information, but I am going ahead and answering it anyway. You may want to Print the Diagrams for future use.

CLICK on the following LINK. It has the Belt Diagrams you will need.
If you would: Before Clicking: Let me know if this helped you, or if you have any additional information or questions. Feel Free to contact me at FixYa.com!
Again my apologies...
http://www.2carpros.com/car_repair_information/year/1987/make/chevrolet/model/suburban/1987_chevrolet_suburban_drive_belt_routing_diagram.htm

here are 4 diff. type of diagram.
Depend on how many pulley you have.
Let me know if this help you.