Would it be fair to assume that if you didn't feel like fabbing and welding it up yourself, Schumacher conversion mounts could be used just as if you were dropping a B/RB into a standard K member? Or are you concerned that the QA1 K won't take the abuse?
Whatever the case, I genuinely hope you have better luck with their products...I used their K member in my '84 Mustang and wasn't even slightly impressed...it altered the track width and wheelbase which made suspension setup and alignment an enormous pain in the ***...probably would've been great for auto cross...wasn't worth a damn for the street.