I have their 6973s now, haven't had any issues with them at all. Just going to the max for the classes that run around here. Also switching to their new gen iii 50mm wastegates rather than the ebay specials I've been running. You'll have to let me know how the 78s perform on the big block. I have a buddy looking at a set for his 440 69 dart.
It’s almost ready for dyno. It’s on the run stand now and I’ve done some baseline stuff but nothing more than timing and idle tuning. I just ordered their 50mm wastegates last week. Hopefully I’ll have em tomorrow.