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Your factory tach won't be accurate because a 350 is an 8 cylinder engine. I put a 350 into a Vega, and my speedo was slightly off because of the differences between the ratios as well. I recommend looking for an aftermarket adapter, or a kit if you can't get the cable to connect into the tranny.
Three different transmissions could be in either the 88 or the 83 or84. The 4 speed auto 700r4, the 9 inch tail t-350, or the 9 inch tail t-375. as long as it is the same type transmission, they will interchange. The 4 speed 700r4 has some internal internal differences between the years, but will still work. The 350 or 375 trannys are identical from that year range.
There is usually only one vacuum connection on a turbo 350. It connects to the modulator valve on the side of the transmission. This valve uses engine vacuum to determine transmission shift points. The other end usually connects to a direct engine vacuum source. A "direct source" is a hose connection on the throttle body that has a vacuum signal available at idle. If it doesn't, then it's considered a "ported source".I have had some experience with the chevy blazer/gmc jimmy series, both the early large body models and the small body versions. The stalling when put into gear complaint is most likely caused by a bad intake gasket which is common on the older versions with the small block V8 motors. The newer versions with the vortek motors also had allot of trouble with throttle body gaskets. If these problems have not already been addressed, then there's a good chance that it will take care of the problem. Other possible sources of vacuum leaks are the pcv hose that is hard and brittle. Check the hose out carefully, especially the side that normally faces the engine. Check the throttle body bolts (carburetor bolts) for tightness. I hope that this information is helpful to you. Thank you for using Fixya.com.
you will most probably need a beefed up tranny to take the power of the engine, I have just installed a 350 supercharged chevy motor in my sons car with a Turbo 350 transmission and a shift kit which I have been told by an auto trans mechanic may not take the power of that engine.
It is costing him $1500 australian to have it reconditioned so I hope it will survive the rides