Best bang for buck

[Don 231]

Hello, I am thinking about getting a cam and a set of ported iron heads put on my 87-t. Question is.. How much as for cost and peformance? My mods are listed in sig below.

 

[don86T]

I think I would go with some tall drag radials first. I'm sure you can use some traction at this point (with those mods and 390 gears).

 

[J Banning]

3.90 gears?