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GM never uses exhaust manifold gaskets, it is a machined fit. The rear main may be two piece in this year, it depends on what engine the car has, you never say, if so you must remove the oil pan. Also if it is a one piece you need the installation tool to install the seal, if you don't do it right it will likely leak even worse.
you can get a new bell housing to fit the tranny to bolt to the new engine. you should be able to order one on-line. you will just have to make sure the tranny will handle the new engine. you will have to drop the tranny to put the new bell housing to the transmission. its not a very hard job, maybe a couple of hours
It sounds to me like you might have a worn out speedometer cable which is normal wear for the year of your car. How many miles does you vehicle have on it? And the tranny is the original one? If its not worn out, it either came loose from the tranny or behind the speedometer. Not very hard to replace
Does the car have the 200R or the 200R4 tranny?? If so - in my opp. it is the cheapest, crappiest tranny GM ever came out with!! It is a metric tranny! You may drop the pan and check for shaveings in the bottom - if clean change filter kit. I went through 2 of these trannys in about a year - i finailly got tired of messing with it and replaced with a universail bolt patern 350 turbo tranny and it as ren top line ever since!
The carb probably needs setup correctly. if there are no other problems, you need to check the idle speed solenoid functionality before doing so. Also make sure the choke is opening up, after it is warm from driving take the air filter cover off and see if the choke plates are open. You will recognise them as being on the very top and will be able to see into the carb if they are open. If you have a 4bbl only the front plates open.
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
Tou can use any olds pont or buick 350 out of an earlier car that had a V-8. you can also install a 400 using a crossmember from a car that had a200r4 tranny in it. providing your car has a frame mount welded in on the left frame rail. otherwise you have to relocate the tranny mount on the exsisting crossmember.
I have an 81 buick that now has a455 olds with a th400 in it, I asol have an 80 cutlass with a 403 and th350 from a 78 pont wagon in it
the trick is to use the non lock-up version of the TH350.