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I've had the same problems as you have....a long long time ago.
have you tried a 1" spacer? there's some spectrum (sp?) company that sells spacers, and they have a neat removable center piece that can be open or a 4 hole spacer....i used the 4 hole spacer on mine (on a 440 with dual plane intake eddy CH4B) and the difference was night and day...i like you tried the like 1/4" eddy thick gasket and still had a heat problem. after i put on this 1" job it totally completely disappeared, and the 4-hole spacer had a second benefit, and just ran much nicer by giving the carb better signal to the barrels...so my off-idle stumble disappeared as well...
also how are your fuel lines routed? do you have a return for a vapor separator as well?




the fuel line is well away from any hot spot but it does tuck in the front below the alternator and sneaks in between the distributor and head. i have rerouted it twice in an effort to keep it away from the block and the head.

i have not tried a one inch spacer. i was considering a heat sheild/spacer set up like this:

http://www.summitracing.com/parts/MRG-3710/

but then i saw this valley pan and got to thinking:
http://www.summitracing.com/parts/FEL-1215/

i would use it without the paper gaskets.

i got rid of my off-idle stumble by using stiffer rod springs and a little richer on both stepups on the rods. it would be nice to lean it out a little as the plugs read rich.

Ben

1963-1967 Dodge Custom Sports Special and High Performance Package REGISTRY