Good numbers! My results on our Mustang MD100 dyno were 406/374 at wheels. My mods are exactly the same, ported top end including port matching heads and a full Stainless Works exhaust from headers to tips.. congrats, now get her out and enjoy it!
Fyi, I dialed my WOT AFR in at 12.8:1.. you should be fine at 13.3 as long as you didn't see any knock..
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