I'm getting new heads built for me by Outrageously Vintage, Inc in Searmount, Maine.
This workshop have been extremely helpful and friendly, with excellent communication together with lots of pictures of the heads as the progress went on. The heads are ready for shipping now, and I'm very exited about getting more power in my currently anaemic '72 340.
Since they were building and porting the heads for me, I decided to ask them for a engine plan to fit the heads they would make.
I decided to just trust the shop with their choices, instead of referring to "my friends on the internet said to use so and so parts".
Still, I'm very grateful to CP and everyone else who came with their recommendations when I asked earlier.
The parts I'm recommended by them for my for my old '72 340 with the new ported heads, milled to a 10.25:1 compression is as follows:
DCC-4452992 238 Degree, .474 Lift Cam & Lifter Package $179.95 (Mopar Performance Purple Cam)
ARP-144-4001 Head Stud Set (Recommended instead of Head Bolts) $93.88
EDL-7803 Timing Chain and Gears $59.95
MIL-16350 Water Pump $53.99
Eddy Performer RPM Air-Gap
And here's what they recommended for carbs:
"Holley 750 Double Pumper Part #HLY-0-4779C $433.95 if you would like a shiny finish Part #HLY-0-4779S $494.95
or
Holley 770 Vacuum Secondary Part #HLY-0-80770 $399.95
The vacuum secondary carb is going to be much better for low end torque, and there would be very little to no adjustments necessary. The double pumper will give you about 10 more HP, but it will take quite a few adjustments to fine tune the low end performance."
I'm figuring that the low end torque of a double pumper won't be bad either, and most likely better than what I got now anyway. And 10 HP more won't hurt when I hit the gas for fun. Also, I think I could use the opportunity to learn a little about adjusting a Holley.
So what I'm asking, would I be crazy to choose the adjustment needing double pumper (DP) over the less adjustment needing vacuum secondary(VS)?
Also, I've read that the DP's needs re-adjustments over time more often than the VS, is this true, and if so is it really a hassle once you understand how to do it?