Never had a problem with suncoast. Actually I ran an off the shelf unit (basic build) at over 1000WHP for quite a while before finally losing the c1s. Got at least 30 4x4 launches and over 100 wot pulls. As for converters, the 7 series is great, 1078 is a vgt dream converter, couples hard but also allows a high flash to get spooled. I rebuilt that trans with a kit from Limitless Diesel (Inglewood) and used a goerend J converter this time around (as I increased charger sizes) and it’s held strong for 15,000 miles with WOT runs nearly everyday. This is one I put together myself with help from Evan. Couldn’t be happier with how it performs and how it’s lasted.