Parts I purchased today for my 383 budget build any suggestions

The combo you are about to put together will be low on torque and not very street friendly. the comp 292 duration cam needs more compression than the 7.5 the piston and head combo you put together. the 268 would be a better choice. if indeed the 452 heads have 219 and 188 valves you can not use them without notching the bore. they probably are equipped with 214 and 181 valves and should be fine.