I had to modify my oil fill neck a little. The fuel system mod on the BCK-103 Kit is straight forward and pretty much assumed once you see where the kit is going.
It's only a matter of time before anyone has issues with anything if you wanna be honest. I will agree that once you sign off on modifying any engine you own it as I have and many others before and after me.
Let's take a poll on how many guys have put a Whipple on a stock 496 and blew it to shreds. Not trying to debunk you or change your opinion. Just saying there is no "trouble free" fast boat no matter how much research you do.
How long did you hold it open? How long are your wot passes typically? Have you shared your RPM history AFTER the kit was installed?
Who installed it? Did they follow all instructions? Was it a shop or done at home?
Just curious - Sorry to hear.