There is only 1 red top 6 volt optima battery. I have one that is close to 20 years old and still good with no battery tender
Sorry I don’t know part number
One challenge is getting bored large enough to fit suitable connecting rods down through. Your 21 stud bore started at 3 1/16” you need 3 3/16” bore which can be a challenge with a 21 stud block. A 37 block maybe but I have never sonic checked one of those.
Mike at H&H can supply you a kit for...
Just a suggestion but a piece of PVC tubing dipped into the barrel all way to bottom like a straw block end and pull out to check for water in bottom of barrel as that would be a real mess.
Time and effort vs. investment. Plus the oil mess challenge and disposal. In my opinion the entire pile would have to be dirt cheap as more and more come out of hiding. In the last year I outbid the scrapper and paid $45 each on 4 nice 59AB engines at an estate auction. At another estate...
There is a cam grinder in CA that will grind the 8CM Merc specs but with more lift (.380"). I have one of these grinds for a 59AB.
Not possible in my opinion Tim. Would love to see all timing numbers.