the old school b20s are no good for vtec. the heads dont match up with the b20a5 block. U prolly of heard of b20vtec and thats only because people use the b20z that came out of crvs. Those are the only b20s that a vtec head will match up. i say u do one of 3 things...

(1) JDM version of the b20a ( i hear they make 10 extra horses

(2) You get rid of the old school b20 and get yourself the b20z and then throw a vtec head on it

(3) keep the b20a5, do up the internals and get yourself a turbo


Thats my opinion.. if i didnt waste my money on my hatch i would of built up my b20 and turboed it, but it all depends on what u wanna do and how much money u wanna spend. Other than that good luck