That's seems to be what i'm getting from most here. I think the most economical way would be to go in baby steps here and get a few springs checked, then back to the track for some driving techniques like short shifting for one. Try some timing loops and play with jetting. This combo should work. Although I thought I played with the timing and jetting enough, but maybe not from what i'm hearing now.
Dave,
It takes time. I have been developing my combo since 2012....Lets talk about yours and see where you think its missing....Right off the bat, your thinking its the heads....Lots of things to check there....Valve springs.....Most over looked aspect of the heads. Pull a couple, check them.....Bent valve causes all kinds of issues....What have you checked and What does it drive like?
