E-street vs Promaxx vs 440 Source

HP range listed in my 1st post is all I'm shooting for..... at least 450.

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I get the feeling you want to be told whatever the cheapest route is, is the answer you want.

In that train of thought.......On a well thought out combo, essentially any factory head with a little rework can make over 450hp.

My 383 made 485hp with unported 906’s that flowed 235cfm.