Is this a cam problem?

Well, you've tuned the hell out of it,so what is total adv. w/o vac. and what RPM is
is it all in?You NEED to know the comp.ratio,period.If you're not in the mood to
pull the t-cover,yank the valve cover and roll the eng. to TDC#1(after you watch
the int. valve close)compression and set one or both to zero lash then measure
valve lift at max. turning slowly by hand. You may be shy a little of the cams design
lift depending on your rocker geometry,but it mite be enuff to ballpark which purple
shaft you have.Even with the geometry way off, you won't lose much more than .020
in.,so a reading of .440 leaves out most of the bigger ones.I ran the 276/.490"
piece and it definitely needed a loose converter which i never did get in it,really
kicked in around 2700ish or so.
Either way,if your A/F ratio and timing(generally 32-34deg by 2K)are good,most
likely cam is too much for either comp.ratio or converter or both.But there is always
the chance of spark energy issues at low speed(incorrect ballast etc.)and other such
"bugs".Keep us up to date and good luck!:coffee2: