I hope some body with more smarts can help.
My plan is to port and polish my stock cast iron exhaust manifolds. I pulled off the right one and measured the holes. The oval holes in the manifold is about 1/16" larger all around [1/8" diameter ] than the ports in the head. My question is should I open up the head ports to match the the round gaskets and all so match the manifold holes to the gasket.
I would only go in the head about 1/4" or less to open up the ports. I don't want to mess up the heads

PS, My dream is to put a STS turbo on someday so I want to keep the stock manifolds.

Thanks