Can I switch the base plate on my 670 street avenger with my 650 DP to bascially make my 670 a DP instead of a vacum secondary? The only reason I ask this is because the 670 is new and I bought it and has, well....bling and the 650 is used off ebay. I've opened up the 650 and everything looks good to go but I know my 670 doesn't need a rebuild and where I'm at with it as far as performance.