Couple lunati cams that will work..From works great ..to will work..
High Efficiency Hydraulic Flat Tappet Cam - Chrysler 273-360 260/260
40 degrees overlap
High Efficiency Hydraulic Flat Tappet Cam - Chrysler 273-360 253/265
44 degrees
May as well pull .025 aka 4cc from the heads if the motor is put or almost apart for a cam install...then you can get bigger on the cam till the gears say otherwise. Soft compression is a slouchy companion