Easiest way to do this just swap short blocks but use the TBI heads, intake, FP, WP and accessories. The roller cam is probably even worth a few HP.
Have the Vortec heads checked for cracks and either sell them and the Vortec accessories and intake, or when you have time and money get a carb or gm TBI to Vortec heads intake manifold and upgrade the FP and tune.
Have the Vortec heads checked for cracks and either sell them and the Vortec accessories and intake, or when you have time and money get a carb or gm TBI to Vortec heads intake manifold and upgrade the FP and tune.