[ta-kid]

Got a stock 1974 350 with 1970 #11 heads on it.I an assuming they reused the 74 exhaust manifold logs when the heads were changed which are proably the same as a 70 exhaust manifold.Anyways there is a 2 bolt flange collar sealing a 2.25 stock exhaust down pipe to the manifold and it looks like no donut, just a pipe seal.
I have a pair of mandrel bent 2.5 inch head pipes ,originally for RAm Air manifolds that I would like to install on the log manifolds.I will need new 2.5 inch collars but wondering if these pipes will be too big for the log exits to seal the same way or will I need a 2.25 donut to seal it ?I am assuming again the a 2.25 donut will be a tight fit in a 2.50 pipe.