Posted this in my project thread but that probably wasn't the best place to put it.  Looking for input on which of these hulls might be a better choice for what I'm trying to do.  Let me preface this by saying choices on hulls here in Hawaii is very limited which is why these are the 2 I'm comparing.  I already have the '78 but haven't gotten too far on it yet.

Use: Mainly a fun ski boat for the family.  Seating for 5 is a must.  Occasionally I'd like to open it up and try to hit a decent speed in excess of 60 MPH (without kids).  I'm building a mild Olds that I'm hoping will put down a touch over 400hp.

My main concern is hull design.  The bottoms are noticeably different.  I know neither is the greatest but does anyone know if either is considered "better" ?  I've read the Tahitis can have stability issues so that's a concern.  If one is known to be more stable I'd rather build that hull even if it costs a little more.  Reason I'm even contemplating the swap is that the '72 is MUCH farther along than the '78.

Couple of lousy pics for reference...  appreciate any input people have.