1/4 race, 1/2 race, etc., etc., etc. don't mean anything anymore (haven't for 20 years). You'll need to supply things like lobe separation, lift @ .050, etc, for anybody to help now
Go to
www.chevyhiperformance.com and look for the budget mouse build. One of the first things they do is switch out for a set of new vortec heads (w/matching intake manifold) and a cam. Should be just about $1000 (if you do the labor yourself) and it will do what you want.