In a 1976 Chevy with big block 454 can you use 4 speed tranny out of truck 350 small block?

No, you cannot directly use a 4-speed transmission from a 350 small-block Chevy truck in a 1976 Chevy with a big-block 454. The bellhousings are completely different. The bolt pattern on the engine where the transmission attaches is different between small-block and big-block Chevy engines. Therefore, the transmission will not physically bolt up. You'd need a big-block specific 4-speed transmission.