I get motors like this in my shop from time to time.
Lots of merc parts,and NO where to start! They tell me " just get it to run." I ask ,run? or run right!
The reed system on this motor can't flow what will be needed to make 250HP.
The problem with you getting any ,what to do info is,where do we start?
Their was a shop in SF called PSA Marine,but I think it is gone? I think Paul would have said the same thing?
You can bring it to me,and I will put it on the Dyno for free, but I'm in Glendale AZ. I don't think you would like what it would tell you?
But what will the timing need to be?
What is it jetted for? With just the staks that has changed.
What are you going to use for fuel? With a .100 cut on the heads you may have to much compression!!! = KNOCK!
We have a big problem on the 2.4 and 2.5 with KNOCK from 3200 to 5100rpm and heavy loads. And that is with a STD motor.A lot of games were needed to get that under control.
You have asked how far is UP!
Sorry
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