yeah my car runs good but it just doesn't feel right ! like there is more there somewhere........i turned my fuel back up to 39 from 35 and help a whole lot much peppier but still lacks topend ? its funny you should mention the spark plugs because mine look alittle funny like there to hot so i thought about going a step colder !I picked up 2 tenths with my old gt40p combo by knocking the timing down to 14* and swapping to a autolite 103 plug. The heads were milled a good bit so compression might have been a little high. Maybe close to 10:1. I really found this out by accident, I was running nitrous with the setup like that and found the car ran better on all motor that way too.
Hey John,Try this, take the timing spout out, put timing at 34-36 degrees locked out. LEAVE SPOUT OUT...Try running like that and see if it likes it. We have always ran it that way with timing locked out. Also if it does like that, then try to run with 40-45lbs of fuel pressure. Keep going up with pressure until ur ET drops off.