Best iron head for the buck is the RHS torquer. RHS stopped making them for some reason and they're very hard to find in the market, even used. Here is a source, Amazon. The brand is shown as CompCams, because Racing Head Service was/is part of Comp in Memphis. It would seem to me that Comp is leaking the remaining inventory out through different sources like Amazon. Same thing was done a couple of years ago with Weiand 8016 Stealth intakes. I listed the last 3 known to man on Amazon on this forum and they were gone in a day or so.
Part #12410 would be my first choice for a torquer motor.....170cc intake runners, 64cc chambers, bronze guides 2.02"/1.60" valves. Sold bare under this part number, no valves, springs, etc. I've looked everywhere on the web and can't find any new old stock. Can't even find any used.
Part #12407 would be my second choice, same head with 1.94"/1.60" valves. Can't find 'em. It's like they vaporized off the planet.
Third choice would be these 12403 units. I'm not sure if they're straight plug or angled plug, but I'm pretty sure they're cast iron guides. I know they're 67cc chambers, 170cc intake runners, 2.02"/1.60" valves, sold bare.
Several years ago when I was doing a lot of DynoSims, these torquers consistently made the best torque on a 355, better than L31's and you don't have to jump through hoops with springs, retainers, vortec intake manifolds, center bolt covers, etc.
Comp Cams 12403 Pro Torker Small Block Cylinder Head : Amazon.com : Automotive
If you're interested, I'll run a Sim using Bogie's cam choice.
Here are the numbers I would use for a Sim.....
0.100" 77 65
0.200" 155 113
0.300" 186 144
0.400" 230 167
0.500" 241 175
If anyone has numbers that they think are more valid than these for these heads, please post them or direct me to the source of your numbers.