My 355 has the GM distributor that's specified for their roller cam crate engines, so I know it has the correct melonized gear for my GMPP RamJet 350 roller cam. I'd at least go with a name brand like Proform which I think are made in Tawain, where production materials and standards are light years ahead of China.
And I make no apologies for being a hater of Skip W. parts, having unfortunately dealt with both their parts and a customer service guy who told me, "We've sold over 800 of these, and you are the first to have a problem." Those parts were (or should have been) simple alternator and power steering pump brackets. But fit was +/- 1/4" or more, and chrome plated-bolts were softer than Grade 1. And my favorite is the ALL CAPS hyperbole on their eBAY store site extolling the virtues of their cheap Chinese parts.