Welcome to CSC!
I don't know what two hulls you are comparing
but there should be NO difference in the Variable Deadrise between the 1972 and 1973 SeaCraft.
The 23' rides like it was on steriods in a 3' chop compared to other planning type hulls [img]/images/graemlins/shocked.gif[/img]
Member "SEAFARI" can answer all your questions regarding interior differences on the '72'and '73 models but as far as the interior grab rail goes, I think somebody has removed it if it's missing.