Dissapointing performance

Maybe your old heads didn't have as bad of a port job as you thought, old heads can be ported to stock rhs heads flow numbers and higher.

You could use more gear and stall and carb and exhaust but if you can't do burn outs there must be something wrong with your tune or car mechanically. Just cause everything worked before the swap doesn't mean it can't fail or changed once put back together.
Go through everything and make sure it's in working order and tuned.