383 deck clearance
One thing I'll add - if this is for a numbers matching deal - you have to use a shop with the high speed cutter - not a traditional mill. Otherwise it removes the stampings from the engine ID pad on the passenger's side just outside of the distributor. The best way is to bring the block in, tell them what piston you're using, and then have it decked to that measurement. building a good 383 takes attention to detail beyond anyother idsplacement because there are few pistons available with decent compression hieghts and the blocks are always tall. So you have to know what to cut it down to because to zero deck you'll have to go further than blueprint height.