Heres what's up. If you port some mag heads..just magnaflux them1st. Dont go crazy on them , follow 63's thread since is directly on those factory castings. Should cost more than 800 bucks with machining and your own port work.
If you buy mag heads....
Unless you have good hand control...and can do chamber work ...just buy the eq still offered and pay a shop to do the seat work for a 2.02...and ask for a top cut to clear the ledge around the valve The SM requires chamber work, more when going with a bigger valve and has a lot of core shift. The eq available now does not need near the amount of work a speed master head does. There is no 270 CFM with just a valve job and bowl sizing with a Speedmaster head. If you only did that with one of those ... it would peak okay'ish but have no balls under the peak.
