How about having your current box inspected/ repaired? If it was working one day and not the next, I would think it might have a bad component or need some new innards, rather than throwing it away.
I have been having a terrible PS howling issue since I added Hyroboost. I was told by several "experts" I needed a new control valve or a new pump, but sent it to Turn 1 instead. They inspected it & said it was fine inside. They made some mods to it, re-valved it, and completely rebuilt it for about 1/2 the price of new (and the mods are to make it work WITH my Hyrdroboost and run cooler). And they turned it in 3 days! They are the most knowledgeable and helpful guys in the biz.
Just a suggestion. Maybe they can get you running and save you some dough. Worth a phone call or 2.
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Bill
'69 Camaro / 534 BBC / DSE Built
'67 C10 / LS-3 w/Magnuson / Roadster Shop Chassis (SOLD)
'71 Blazer / LT4 / 8L90 / Roadster Shop Chassis / Ride Tech Air Susp.
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