you can plane 1/8" off the top of the 3 7/8" pistons , when i built my 77 motor 34 years ago i planed 1/8" off the pistons and the held up good for bothe pulling and light field work. i also had the crank welded on offset ground to give it a1/4" stroke. i used a super 77 crank and rods for the extra strength. i run up to 4000 rpms when pulling with no problems, (knock wood). you can weld and offset grind the 88 crank and get good results.hope this will help, chuck
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