It will fit, but you might want to have the crank, rods, and pistons balanced first as there is a big difference in the weight of a 350 piston versus a 305 piston. Wouldn't want to get it all together and have a nasty vibration at certain speeds.
Chevy in 1977 changed the rear main oil seal to a one piece seal. the older crankshaft wont work.
116"
Yes, beginning in 1977.
10w-40.
9:1.
4, to 6 degrees advanced, or BTDC.
Mounted on the front side of the engine block.
all chevy V8 are the same 18436572 in a clockwise distributor rotation when viewed from the top.
The 75 - 76 Was a transitional year as for 69 - 74 where the same
45, for an iron intake, 35 for aluminum.
Mounted on the engine block. Follow the fuel lines from the carburetor backward and you will find the pump.
They did not make a 400 sb Chevy in 1974. But from 1975 to 1980 they did and the answer to your question is 8.5:1 from 1975 to 1977 Then from 1977 to 1980 it was 8.3:1 ratio. That is Advertised compression ratio. I may stand corrected on the date when I said they did not make a 400SB. But The info. I gave you was all I could find. NEUTZ.