Based on all you said I think the GT is the best option for handling manners. And I'm sure the trans out of the gt350 should be a easy but expensive swap but also well worth it. You'll still have to drop a lot of dough in the suspension but it's the better platform to start with if handling is the goal. With all that weight over the front axle and the solid axle out back, it would be a tall order to get good balance out the gt500 with out spending for the gr40 suspension from griggs.
Sent from my PURE XL using the svtperformance.com mobile app
Sent from my PURE XL using the svtperformance.com mobile app