How much power does my coupe have?

[da89cup]

I'm new here but i would like to know how much hp my stang has, & possible 1/4 mile time? I have an 89 coupe with a 351W with new pistons, cam, stock 5.0 heads, stock 5.0 headers with 2 flushed cats, k&n 9" cone, 80mm mass air sensor, 70mm tb, upper cobra, GT40 lower, 190lph pump, 30lb/hr injectors, stock 2.73s, custom 2.5 H-pipe, with dynomax race mufflers, & 4"-24" long tips. I don't know where the 351W, came, & pistons came from because I bought it with that in it allready. This engine used to be in a 79 capri but I'm pretty sure those cars never came with the 5.8. The cam was changed like 5 times so I have no clue what the numbers are for it. Hope to hear something soon.