It's my understanding that the trans crossmember is the same. Will I need new motor frame mounts? Will truck mounts work? If I keep the stock 8.2" rear end, is it going to explode if I do a burnout? Throttle linkage?
It's my understanding that the trans cross-member is the same.
Yes it is.
Will I need new motor mounts?
Yes any engine over 300 horse power used the interlocking high performance motor mount
Will I need new Frame Stands for the Motor?
No! The ones bolted to your frame work fine. Only the Camaro and the Nova required changing the Frame Stands for the Motor to raise it to clear the steering gear box ad shoved it over an inch to the passenger side to clear the clutch and steering column as well as the gear box.
Will truck mounts work?
If I keep the stock 8.2" rear end, is it going to explode if I do a burnout?
Probably. But the tire is the weakest link, so it will slip first. However a three block long burn out will probably weld the axle to the wheel bearings (snapping the wheel off at the end of the housing) as they are splash lubricated and will run dry if you push your luck.
Go with late model cable linkage. The truck that has the donor engine will have a throttle cable set up for a Quadrajet that should bolt on to another Quadrajet, but will require a new aftermarket throttle cable bracket for a Holley or a Carter AVS.
Big difference in BBC engines from 1974 through 2001. They all had "peanut port" heads that started out at 210 cc but dropped to 190 cc. From 1965 through 1973 Chevy used the oval port head (peanut port is round) that measured 230 cc, or the 320 cc rectangular port head. Bigger difference was that starting in 1996 Chevrolet redesigned the BBC introducing the Gen V one piece rear main seal engine. All of these blocks are four bolt main with a cast iron crank. It will not have a clutch ball pivot point (because the engines were all in front of an automatic) and it will not have a provision to bolt on a fuel pump because they were all EFI. Additionally Chevy changed the cooling system so that the older Mark IV heads can not be used (they bolt on but you will have a water fall in the lifter valley as the coolant holes do not line up).
What you want is a 454 out of a 1970-'73 Impala, Corvette, or pickup truck with a manual transmission.