engine problems

i just got a 91 chb dx for $600. the head was blown so we got another 1.5 to but in it. well we but the engine in but it won't start. the engine is getting a spark and then it shuts down after a couple of turns and the main relay is making a wierd buzzing nosie when the key is turned forward. is there a cutoff switch and if so where is it. thanks for the help

Could the relay be bad? Try to see if the engine is getting gas.

sounds like the relay to me also.

Check all your grounds!!! Hondas are very fussy about ground wires. I have had some strange things going on after motor swaps that all cleared up after we fixed a loose ground.:)

engine is getting gas and a spark. thanks for the help