Since you already have them, there is nothing wrong with running GT40 heads. With a little work they can make very good power. GT40Ps are also good heads - either will make 300RWHP with the right cam and intake.
If your tight on the budget, paste the link in my signature on how you can get much better power from the stock intake system.
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Tom (Torque) Moss
88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE).
http://www.fastlanecars.com/
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