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.
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.
Mounted on the engine block. Follow the fuel lines from the carburetor backward and you will find the pump.