I cant seem to find pro mags that are self aligning and 3/8th...I find alot in 7/16th and i found regualr mags in 3/8th but they are not self aligning.

 

LT4 springs are cheap but are marginal...

maybe 918s? not sure on the stock cam if they are to tough?

 

1318-16 Comp Cams Pro-Magnum Self-Aligning Roller Rocker Arms, 3/8" stud, 1.6 Ratio . Any supporting vendor that sells rockers should be able to get them (ex. Herron Performance).

 

Did you even look at the link I posted? haha

 

If you think you may have any "cam" plans down the road get the 7/16 version and studs to start with. To install guide plates you will need to remove the studs anyways. A set of ARP studs are not all that expensive and being able to do your first lash adjustment on new studs makes it that much easier(no binding or catching). The factory crush nut usually boogers the threads enough that the poly's will not turn smoothly by hand. 3/8 to 7/16 is a big increase in rigidity but not much more money and the rockers cost the same.

 

Do it right the first time...