what intake is this????????????????

ok, i thought at first this was the stock 340 intake, but it looks to sit so high. i pulled the heads off the 340, and they seem to be ported? they do match the gaskets that i took off.

cab you tell me what the advantage i will gain from running this intake and heads over a set of j- heads i have that are ready to go on an engine.
do you think i should just sell the j-heads and put the money towards getting these redone?