420HP N/A 302. Please Help With Accessories

[BowTie Eater 5 Liter]

Ok, now i need to know:
How much does a mass air conversion cost?
Do they make X-pipes for long tubes?
What Ignition should i use? (Read combo below)
What Size Fuel Pump? (Read combo below)
Where do you get your pistons Fly Cut or notched(what is the difference)?
What timing *?
What Size valve covers (Tall, standard)?

Here's the combo

Stock Bottom End Of A 5.0(stock forged pistions, notched for the big cam)
Comp Cams XE282
AFR 185 Heads (Milled)
Comp Cams 1.6 Rockers
Trick Flow "R" intake
75mm throttle body & egr
24lb Injectors
Pro-M 77mm MAF
& 1-3/4" Full Legnth Hookier Headers

This motor made 423 hp @ 6000 RPM & 381 ft-lbs @ 5600 rpm For MM&FF, But they used an automatic 5.0 Computer (they reccomendid a manual 5.0 computer), & 70mm t-body(they reccomended a 75mm).
this motor will take the place of the 351 i planned to build.

any help is greatly apprecieated


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1988 Mustang GT, T-5
No Smog Pump (Shorty Belt), Dumps At The End Of Stock H-Pipe (Sounds Mean), K&N Air Filter (Stock Air Box, Removed air silendcer), 198.9 rwhp @4200 (235 Motor!!), 285 lbs-ft @2900 (336 Motor!!!).
My Stang This Is What Dynomax Ultra-Flo's Do (Soon To Be On My Stang!)