Which Trick Flow Heads with 318 (future 408)(part 1 of my plan)

Hello, I'm planning to build a 408 in the future and think the trick flow heads would work nicely on it. I don't want to fork over all the cash at once and was thinking I could get the trick flow heads first and use them with my current 318 for now then once I save up for my bottom end 408 I could swap the trick flows onto it.

This would be a street car with a couple drag races yearly and possibly an occasional autocross and looking ro run pump gas. Could this plan work and if so which trick flow head should I go with as there's a few different models (I'm assuming the cheaper models would do just fine).

I'm thinking the 61417801 or 61417802 version? The only differnce between the two is the 802 version has 0.030" more max valve lift (650 vs 680) and the 802 version has 10 degree locks vs 7 degree for the 801 version and $10 price tag between the two.

Which one should I go with? What else would I need to bolt these heads up to my current 318? Could I swap over the current rocker setup? I'm assuming push rods would have to be double checked for length... anything else?