Since we dont know which 4g64 you have, I would guess it is a 7 bolt.
The point is you will not be turning your 4g64 into a 4g63, you still would have a 4g64, your thread name is misleading and confusing. Maybe you can change it.
Mandy
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Very true hot tanking was prohibited many years ago due to pollution, I said hot tank as a common language in the trade but it is really an oven nowdays.Mandy
For sure have your block hot tanked, your crank looks like it needs to be cut, there are some good marks on there, take to machine shop and maybe it may just need polishing, let them make the decision.
WE sometimes try to save a few bucks and pay the price later, have rods check by machine shop...
Open track days are a lot of fun, this usage would change things, I am talking about strut braces, a member of this forum makes them and it should be one of the first things I would add.
Look at the track layout and see how many turns are left or right, this will tell you about mods to fuel and...