Replacing FAST EFI on HP 383, with what?

That cam is too big for the amount of compression ratio you have. The heads are far more than you need for your combo.

OMG! What are you talking about!?!?!?!?!
Oh hell no and no way!
Consequently, your off-the-line performance will be soft, and so you will need about a 3000 TC to get moving with any kind of dignity. That cam wants headers to take advantage of the overlap period. And also to pull up the bottom-end torque.
Oh hell yea!
As it is 3.55s will be fine once you hit 25mph.
Where did you get the 400 hp number from?
A lot would be in tire diameter. Along with the converters stall.
Tha combo is an easy go north of 400hp level.