The Motor no. is located on a machined pad on the block, in front of the left hand head. look the no. up at a site named mortec.com or call your Chevy dealer, and ask them to look it up on their computer. this no. will give you the info. your looking for.
It sounds like you want to know how to change the engine in a 1970 Chevy truck from a small block to a big block. If that is the case; there is no difference in the mounting of the engine to the transmission or motor mounts. The exhaust system will need to be changed, and the small block radiator might not be big enough to handle the extra heat made by a big block when it's being worked. (such as on a hot day or pulling a heavy load)
The numbers on the drivers side rear of the engine right above the bellhousing are more helpful.
where can i find a vaccum diagram for a 1985 Chevy truck with a 350 small block
block hugger headers
yes, they use the same block design and block mounting though those years. you would just need motor mounts for a 97 as thickness and offset differ slightly.
Best bet would be to pick up a factory service manual or one of the aftermarket manuals such as Chilton's, Motor's, or Haynes.
yes
Yes- possible flexplate chage
No the 350 has always been a small block. The smallest big block made by Chevrolet was the 366 truck engine and the 396 car engine.
No it is not.
yes as long as they are both v6s or v8s
It could be done, but, IMO, not worth it. You'd be better off going with a GM small block and a 700R4 transmission.