1/4 mile times

I have a few questions, was the cam ever ever degreed in? If the cam timing off that can kill what what little bottom end you have.

What was your total ignition ting set at?

What kinda of convertor is it? Is it used, is it a 11 or 10" you need to see what it does stall at.

Carb jetting ?

My opinion is all these should be looked at 1st. My opinion is your compression ratio is probably 9 to 1 now with aluminum cylinder heads for WIW.

Other than that i would opt for a convetor that will flash a real 4500rpm in case you ever step up.