I'm going to agree. I have a 3.55 suregrip that's lived behind my 410 stroker for the last 4 years. It's a cruiser I don't beat on often.
If you just wanna cruise with the occasional burst then you should be just fine. If you plan on EVER going to the strip, upgrade now. Sell your existing set up and find a 8 3/4. Cost of finding and rebuilding now is going to be less than fixing the damage later.

Just my pennies
cc.