318 heads. whats your route??

Moparmal,
215 cfm's with a 2.02, the port velocity had to have been down with that large of intake valve in a small port runner. This is why I say to run the 1.78 intake valve and we get the same amount of air flow infact a bit better at 228 cfm's, and I didn't weld nearly as much, and infact I didn't have to weld any on the 302 heads.
So far the best that the heads have done is 1.57 60' ft. and 7.53 1/8mi. @ 98 mph and at 3330 lbs. this is a stock 71 duster with a roll bar and driver.

In any case try to stay with the smallest valve per the head used as this will keep the velocity up to or at it's highest point easier. The reason the 360 heads ran faster is the intake valve was the smallest of both heads and port velocity was stronger in them. Now imagine if they had the original 1.88 valves in them they would be even better yet.

I've spent 20 years tell'in folks bigger valves, but this isn't so anymore as heads have gotten better in port shapes and chamber shapes the need for larger valves isn't as big a priority, infact the need is almost non-exisistant. About 5 years ago I went backwards as most would say and the performance went way up. Thanks to CAD development it made it easier to understand and learn, and see why.