Well I had that kit with a Precision 63mm. Never dynod or tuned other than by track times and feel. At 17 psi (at the top end with boost creep, turbo probably maxed out) it ran 110 mph in the 1/8 and about 3250 lbs. Simple stock block, lil cam, TW's, cobra int, c4, 3.73's on 28" et streets.
110 in the 1/8 should be almost 140 in the 1/4 (assuming it would have made it out alive after that second 1/8 lol), so the math says it was well over 600 hp with a hillbilly tune. Not sure if that really answers your questions, but hope it helps some.
Scotty we need more power!!!