I bought a 6.0 Vortec with a 112 maggie, gt2-3 cam and 90 mm tb. I'm putting the engine in a '57 Chev pickup...what size fuel pump do I need...Walboro 255 do the job?? Where can I get a tune....quick flash of the ecm to get me going??

 

Walbro 255 should do the job just fine with some 42-60# injectors depending on the boost level you plan to run. As far as the tune I'd try to find someone local for something like that, if possible.