The LT1 intake is fairly easy to mod if you can weld aluminum. You cut off the EGR portion at the rear of the intake and plate it. Then use a normal SBC intake and make a template of the distributor hole. Transfer that to the LT1 intake and hole saw it for the Vortec CMP Sensor (Distributor). Cut out a plate with a hole or machine a circular boss that will fit into your LT1 intake hole. Mock up the LT1 intake on a SBC block with its oil pump installed and install the Vortec dist. Let the dist find its sweet spot and weld in the boss.

Jeff