That might work to use those domed TRW 383 pistons in the 426 block and have a decent compression ratio. Another area to look out for is when doing piston swaps like that is the piston to counterweight clearance, I believe the 361/383/400 cranks have a smaller counterweight diameter compared to the larger 413/426/440 counterweights so those pistons might come pretty close to the counterweights.