Thanks again Mike and absolutely a good point.
Thanks also for the info on your set up Toe Cutter (thats so original Mad Max/Road warrior.... I like it), I am definately leaning for the 347 set up (is the 363 the same stoker kit but with over sized bores and pistons???), and definately want to use the same block that I have all ready for the reasons you highlighted.
This main girdle looks to be the way to go, noting the above and Mikes recommendations.
Thanks for the help with this guys, I am learning lots about this car now, and some good best practice recommendations are coming through loud and clear...so Cheers...Adz