Port my current M1 single plane or install the RPM Air Gap?

pittsburghracer said

Are All the M1 intakes Thermoquad type of carb flanges??? I never had ospread bores

Click to expand...

I believe all single plane M1 intakes for standard heads non W series heads are spread bore and I've never seen an M1 specific to the W series heads. I'm sure they are out there but I haven't seen them. Every M1 I've seen since looking for info on the M1 leads me to spread bore intakes.