bnxbombers

thanks all for the great info - I did go to Motorsport and they referred me to a shop near them. I have an appt next week - I'll update.

Plugs wires are blue NGK - replaced them recently - no change

e88 - which I believe is stock

Hi all - new member here. Need help with a long time issue. I have owned my '73 for 10 years and have had a perceived problem since I have had it. The car has SU's, a 6 into 2 header, 2.5" MSA exhaust. All smog equipment removed and air injector holes capped. It starts and runs great - sounds fantastic. But - has a rough idle and doesn't want to run over 4500 rpm - at 4000 it flattens out and there seems to be no additional pull over that. No sputtering or stalling, just loud and rough with no additional power. Almost like the tach was wrong - like 4000 is really 6000. But with that big exhaust it should pull much stronger. I also have a '70 bone stock, and although I have not run it to over 50 (it needs restoration) it seems much smoother and stronger. The carbs were tuned by a reputable mechanic in NJ and the timing set and points/plugs/filters replaced. Voltage is good at over 14.5. Prior to that the car ran very rich and dirty. It seems to be much cleaner. Here's the kicker - along with the car came a box of parts - a cylinder head was included. I suspect the head/cam were replaced - but with what? How do I figure this out and who in OC/LA can work on it? Thanks and sorry for the long story.