score! but i need help

well my goal with the 318 is 13's, with the 360 it'll be like high 11's

i figured if i bolted on 360 heads, got some new rear tires & a posi track, 13's wouldn't be a problem

but in every tech article i've read about 360 heads on a 318, the intake was fine, but the exhaust was too small

so the plan was to get a template from mopar performance & just port the exhaust to that size, it doesn't seem like there's too much room for error that way

and okay, after i buy a new tranny, rear end, and get the 360, i'll buy a new ignition