The hazard button was smaller in 70 , 71 -74 was fatter you can open the slot in the column or as I usually do file away at the rear of the button until it fits smoothly in the slot
I agree , with most of that .
RPM heads ported gained 3 hp over 452 heads ported , total waste of time .
Long rod engines rule IMO
The smaller 440 ports do increase velocity through the port & I have created awesome swirl with them . ford heads are too big / lazy except in very high rpm builds
In my experience I have seen so many MSD Failures I would stay away + no parts store carries parts , ! customer had a $300 tow bill when the MSD quit 100s of miles away , a simple Electronic conversion kit from Mancini is basically a factory design & parts are available
I suggest going original ,Mancini has kits , Rev-n-ator has the best ECU ,If stranded at least parts stores carry parts .
Not a fan of MSD , too many problems .