[Coley]

Sometimes these types of conversations need to be reset in order for them to move on in the correct direction....so quick recap.

You have an engine that has 70 psi compression?...what?...I don't think that would even run, so you need to recheck that.

Next up, if you do have low compression (but maybe more than 70 psi)...then its clear you aren't happy with the performance....fine, understood.

Next: .......ready?

What is the budget you have and are willing to put into this to achieve something close to 400hp?

This answer and feedback needs to come ...waaaayyyy...before how to do it.
Respectfully,

Coley