694.1,
As far as upgrades during the rebuild
Memory may be sketchy)
1. Old stock rebuilt complete original configuration oil pump.
2. Machined valve guides and installed positive seals.
3. Machined down and threaded rocker studs and installed ARP screw-in studs.(So no more stud oiling)
4. Replacement stamped steel rocker arms with the hole for oiling through the push rods.
5. Comp Cams chrom-moly push rods in the correct length to account for the changes being made.
6. Stud oil galleries in the heads were thoroughly cleaned, then I threaded the front holes and installed a screw-in plug with a relief hole to allow the oil to continue to flow from the cam journals up through the heads when they were stud oiling, but not have that oil trapped in the heads with no way to get out.
7. Double stacked cork valve cover gaskets so the stock valve covers would not make contact with the new studs and rocker arms.
8. Changed the double valve springs, to single beehive style.
9. Used 1956 hydraulic lifter part#. (1955 was literally 1 year only)
10. Removed road-draft tube and installed a pcv valve venting back into the carb riser block.
11. Timing cover machined to accept rubber seal around crank snout to replace cork/spring setup.
12. Pertronix points conversion in distributor.
13. Oil bath air cleaner gutted to run a paper type filter.