I wish I had half the old 92's I have scattered all over the country in the good old days ( well division 7 anyway). Here is my 2 cents and reasons for this direction. CHOOSE the 392 !!! The 92 was around in the time that all the aftermarket parts were being born and everything is interchangeable = Donovan, pink and so on all made items that were for the 392 block. You can find aluminum heads cranks, rods, crank girdles and pans, valve covers, front timing covers and so on. Granted this is all collectible stuff but the demand is still on the low end but making a comeback so pricing is reasonable compared to the difficulty to find all goodies for the less popular IE Red Ram and so on. I would stat away from old raced stuff and use STOCK internals as they will be in better shape and not need machine work to make all compatible.
A 92 will a mild boost of 5 to 8 pounds of boost will live forever on the street with NO regular maintenance like when you have 40 pounds of squeeze pushing bearing out etc.... Good luck finding NON cracked heads as they all crack from plug hole to valve seats and across the seats. The plug hole cracks rarely hurt anything and new valve seats stop most of the problems on a wet or water cooled engine (we filled the block with plaster and ran them dry so cracks were no big deal. Adjustable push rods or a stock cam Will let you update to about any combo you want there. Use the marine valve train if you can find at a good price. The old Hunt or Vertex mags are easy to find and make for trouble free running. A 6/71 blower is plenty and cures problems of the bigger blowers you do not need anyway. The 1/2 pitch stuff is so cheap to run as industrial timing belts are easy to get but the metric pulley stuff is easier to find now days. Run about 10 to 20 percent under driven to keep street-able. The Carter AFB was the most tune-able and easiest to modify (remember it always sees full vac when sitting on top of the blower. New carbs now are around but modified carters should be easy to find as who needs them anymore. The old bug catcher mechanical injection converted to hidden electronic injectors is WAY COOL but $$$$ too.
Getting pretty windy here so I will stop but finding an old drag racer and digging through his old goodies and memory is a jump start. Nothing cooler than a blown 92 with mechanical hat injection to make my vision of a TOY.