I just did another set of real mild port (blend CNC out, & hand do chambers) EZ-1's & flow #'s from .200 up are quite bit better than even a CNC RPM..... Have another set of brand new Modern RPM's in shop @ moment as well for some minor work, & the EZ-1's I just finished, which are copy of the ones I have on my Road Runner are 20-30 CFM better from .300" up...on intake side, & exhaust is very close, with slight edge to the EZ (only couple cfm different @ any lift) & the cost on the EZ-1's with minor hand work is about sames as a set of CNC RPM's. I'd rather have the bigger runner & flow of the EZ's than the RPM's especially on a 470. I like the INDY chamber better than the RPM as well..... The EZ' with basic Prep (CNC blend) end up in 282 CC runner range. Full 295 CNC EZ's obviously push cost higher than a set of Modern or Hughes CNC RPM's. All depends on budget I suppose.....

The MP heads you currently have are basically RPM's with a MP logo.