how do i id a set of chevy sb heads ?they came off of a 350 or so thats what i was told. i actually heard the engine they came off from run and it ran well.i bought a sb350 .030 with flat tops and i think a stock crank.the motor is just that the block crank and pistons.i got a pile of extras with it like a set of heads that the dude said came of a 350 4 bolt?? i got a weiland single plane high rise and a factory aluminum 4 barrel intake from who knows what. Block #s are14093638 i cant find the outhers yet do to nastiness all over the block.got it all for $100.what i would like to know is how do i identify these heads they have straight plug holes if it helps.