Fel-Pro intake gaskets

Thanks. If I just went ahead with OEM type gaskets i would save money and have nobe of these questions
I'm using the intake from my 73 318. The choke mecanism has a small electric heater in it too so as the choke would open just much slower.
It doesn't make sense to have a working heat riser in the right manifold if the crossover is blocked though. I think I will razor the passages in the gaskets so I've answered my own question.
I still need to know if the front and rear rail gaskets can be trusted to not leak.
I can put the dowel pins in to help hold them in place. All the fingers from the head gaskets are still there too.
I guess what bothers me the most is with approx. .06 void to fill , I'll need a whole tube of RTV to close it up without the gaskets.