Vinny,
You have to find or prepare a SpinTron block to get started. What is used is generally a specially prepared trashed block. This custom SpinTron block to have the same deck height, cam bore and lifter bore as your combination. I know of race shop in NC that would work with on the testing. I am sure there are others. The testing cost is similar to dyno work. You could make great progress in a day if your cam grind works and you have access to numerous parts.
The SprinTron equipment is sold by Bob Fox who is also a primary manufacture of customer pushrods. I was fortunately able to test at their Detroit facility. The pushrod company is Trend Products in Detroit. Bob also owns Diamond Pistons. Trend makes many of the private label push rods you see in the valve train industry.
You only need one intake and exhaust push rod so you can go well prepared for testing for a few hundred $ with a few different valve springs, maybe two lifters and numerous push rod options like 3/8, 7/16 double tapered in wall thicknesses like .120, .180, etc. It is pretty much a parts swap process to find the close to perfect stable combination. The change time for small changes between pulls is 10-30 minutes.
If you want more info, send me an e-mail and I will call you.
Sprague

Thats great information, thanks. Unfortunetly, being down during the short New York boating season, doesnt allow much time for exotic testing. For now, I am going to put the engine back together to the best of my abilities and re-evaluate in the winter.

I agree that this is a better winter project. The Dart block we used was actually prepped in NY. The NY engine builder Mike Riley, MRE Power Products and I partnered with is a NY based Northern Dirt Modified BBC engine builder friend of Mikes. Our set-up's were the same. If you are going to build with a close to standard 9.8 deck height and use the 55 mm cam bore you could most likely borrow/rent this test set-up. The .937 lifter bore can be bushed down to test with smaller dia lifters if you prefer. They also bought the drive mandrel from Trend so you would be able to pre-rig and show up ready to SpinTron test. This set-up also has the necessary dry sump oil pan and is rigged with a Jessel timing belt system.
You might be interested in using MRE to build the long block using the set-up we tested. MRE's 505 ci NA engines made 780 HP on Sterling's dyno and 765 HP at KE's in marine dress. The Dart IE ports were designed & ported by OSO's JimV.
After 20 years, 6 engine builders and nine pairs of engines, I am finally there...

Any updates on the EZ Rolls?

Anyone tried these? We are rebuilding our motors and ran crane .904 lifters with zero issues.