Maximum lift?

Another question. Does anyone know the proper name, or a part number, for the "spider" on roller cam engines? I've tried searching Mancini's site but can't find it. I found the tappet alignment yokes & the lifters, but no spider.

I might have found the name of the part. It's an "Alignment Yoke Retainer" or maybe a "Lifter Guide Retainer." Depends on what Mopar book you want to believe. Still havent found a part number. Can't find anything listed except for the V10!

Another question about the heads. If i go ahead & do the hardened seats, new valve job, guides, etc, will it be worth it to blend the bowls & smooth out the ports if I'm going to run the 340 exhaust manifolds? Or are they too restrictive to bother?