been gone for a couple days----for Tech--the longer rods will let the piston dwell at top and bottom of stroke which will allow for filling the cylinders a little better, but--(there's always a BUTT)--valve notches might need to be a bit deeper as the valves will be more off the seat while the piston is up there---that high a compression does create some blockage to the flame travel from the dome(hemi would help) Yeah, Dave---they ran hemis in everything back then--look at one of them!!!!