Twice pipes are cool but not without a downside.
No carb heat in a 235 engine at 0500 hrs on a real cold 40 degree Southern California morning sucks.
The engine spits and jerks and refuses to go beyond 2000 RPM.

Twenty minutes later, all warmed up, she purrs like a kitten.

I guess I could route exhaust heat off one or both of the two (now plugged) threaded ports in the Fenton split manifolds to a brass or aluminium valve (that I would have to make).
The brass or aluminum valve would be bolted to a stainless steel cover plate on the bottom of the original intake manifold.
Hot air (exhaust) would toast the bottom of the intake (and carb) when the valve was open and could be closed after five minutes of warmup with a cable connected from the valve lever to the dash mounted Throttle control.
Is there an easier way?
Has somebody already done this and maybe even marketed a retro kit ?
Any suggestions?
Mike