Carb selection help, please ?

'70_Duster_340 said
Update;

If I power brake to about 1500-2000 rpm's and mash it to the floor, she seems to get right up and run strong to 6200-6400 rpm's, but if I'm driving along at say 30 mph and mash it, there's a stumble or hesitation, and then she puts ya back in the seat ....

It could be worn plugs or not enuff pump shot.

The avenger came w/ 3 springs for the secondaries .. I tried both the lighter and heavier but not much of a difference....

You'll probably need the track to see any difference if you can't see/feel it.

I should also state that I did a compression test this week, and 6 holes were right around 135psi, #6 was at 115, but #7 was only 85psi... I squirted some oil in the cylinder but stayed at 85 so I'm thinking valve guide or stuck valve or something in the head ???

It's worth a check. What about a worn out cylinder, bad rings/ broken rings?

Also, can't get the car to idle for **** at a stop light with the brakes on ... need to keep the idle pretty high to avoid stalling....

WHat is your vacuum reading at idle? Where is or how is your distributor set up and timed? Did you dial in the cam? How far open is the butterflies of the carb? Check choke setting?

Kenny

Good luck with this. It's not easy figuring this out via the net.