For a 11.50 and up ride, I would go with frame connectors, ladder bars to make full use of stock wheel wells. Will have to set the rear axle back about 3/4 inch.
Front would get a home made rack and pinion, coil over/spring combo with pass side shock tower layed over to fit TTI 67 up bb a body under chassis headers. I don't know if going with the rack and dumping the torsion bars give enough room for the headers, but plan to find out in the future. Those two moves open up a ton of space combined with a little shock tower surgery. The plan would be minimal shock tower move to keep the stock appearance theme as much as possible. Motor would be a 512 BB low deck, Indy dual plane with a juice cam and eddy heads. If you go conservative on the cam, it should stay in the mid elevens and idle like a kitten. Want more? Roll bar, head porting , looser converter and a big flat tappet and you are running 10.s Want 9.s? dump the dual plane for an x type intake, cage /dominater/roller.
Another route would be a hotter motor, no roll bar but a throttle stop to keep you at 11.50, but a mean mph!