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I actually wound up going with the 270s (hopefully they show up eventually). I bought the 240s because summit had them in stock one Friday afternoon when I went onto Summit last fall. I wanted the 270s then but the 240s were in stock. I didn't end up installing them over the winter, and don't...
Selling a brand new set of TFS TFS-61617802-C00 heads - these are the Power Port 240s with the 1.55 springs and standard retainers (138 lb on the seat, 420 lb/in spring rate). I bought these for a project that changed directions. Still in TFS boxes and bags, were opened for inspection but never...
That looks like exactly where I would start - I would just say be sure that you've got 20 degrees at idle with the vacuum advance disconnected. You can experiment with a bit more timing, up to 24 initial and 38 total are not out of the ball park. But that setup is a good base.
You can check how...
Look and tell us how it is set up. Often times running manifold vacuum at idle means intial timing (base mechanical without vacuum advance) is low. Instead of 20 degrees initial you might have 10 + 10 degrees of vacuum advance. Idle is good, because there is 20 degrees, but when you stomp on the...