I have had to work on the oil pans and valley covers from both Ames and Butler. My approach has been to assemble those parts with all the fasteners, snug. Then I work the flanges with several sizes of shot filled hammers I have in the shop. Also have to use a brass punch in some areas to work out the fit. Also had to slot 1/2 the holes in a recent 68 GTO engine build with an Ames pan. It's just the nature of the beast. The Ames pan fit at the timing cover had about a 3/16" gap before fitting it. Be aware, the aftermarket oil pans have extra interior volume vs. the OE pans. Can't really see it from just looking. But I filled several aftermarket pans with measured amounts of water and they hold about 1/2-3/4 quart more liquid to reach the same level. FWIW.
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