Re: working a 250 x flow
I did the exact same thing on my XF, it was a 4 speed manual.
I put on the stage 3 COME head, their CLH-219 cam, redline intake manifold and 465 holley. I needed the dizzy to be regraphed to suit as well.
It put out high 140's on the dyno. I thought it went pretty well. It would beat VT 6 cy;linders, VN SS's etc.
10 months later I put in a 351 with an auto, it shat all over the 6 cylinder.
Surprisingly fuel economy was better with the 8 as well.
Go the 351 mate, you wont regret it.
Twin Cam EA falcon
SWB Ford Maverick