Personally, I'd stay away from Zex cam, they're not bad, but you don't need them.

I also would not recomment SRP, they are not very tollerance friendly, being only about .01 w/in spec.... a good piston, such as wiseco, or arias, will be .001 w/in spec.

I recommend building your D series... it's less expensive then a swap, and it's fun to beat up on the swapped cars.