Rockers hitting spring retainers is a pretty common thing and not just a Pontiac head thing. Your engine builder should know this if he's been around engines long enough.
Some of those brands, especially aluminum bodies like the crane are pretty thick in that area for strength.
Pretty easy to clearance them. Many machinists do that all the time.
But like I mentioned if you go with Harland Sharp or even better yet go with the steel Crowers, they are stronger and thus require less material in these areas and clear spring retainers just fine. It's the only 2 brand of roller rockers I'll use here.
Your machinist should have suggested that from the start, rather than changing engine manufacture all together. That just causes other geometry issues. The only benefit going that route would be a ratio increase and that's a lot of trouble to go through for that when you can just specify a camshaft from the get go to do what you want.
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