I like the idea of exhaust heat because its much faster then water heat, but in this case, even a 3/8" line won't provide enough heat till its been driven awhile.
You will need some type of heat full time or you will find a flat spot when accelerating, been there and done that! Heated intakes are not just for warming up, it also keeps the fuel vaporized. The intake hanging off the side gets a lot of cooling air from the fan, and the fuel atomizing creates a cold mist, so its no wonder they won't run! A V8 intake has a natural heat source under it, even with out the exhaust cross over.
Use a water plate and pipe hot water right off the thermostat housing. You could even make your own plate if you have a hack saw and a grinder, just use a gasket as a pattern.
Joe
