[Bobby Zlatkin]

There is only one 1970 combination that will put you in G or H, a 300/350.
Claim it as a 1969 and add the 255/350 to that list.
However, to be competitive in either, you will have to break the bank unless you have a big bank.
Or, unless you buy one already built starting at approx. $17,000. More for a better one.