If you are looking for something that is more "off the shelf" (read: cheaper), then you might want to look at one of the Howard's Rattler series. You can find them for just under $300 on Ebay right now. Those are ground on 109 lsa (close to the 110 you are looking at). Here's a link to where they used the smallest one (280/288, 227/[email protected]) in a 416 stroker (340 based) build...
Pretty impressive numbers...and that's with 1.5 rockers and heads that appear to flow less than yours. Of course they tried to use 1.6 rockers but, I think that was more of an issue with the Howards lifters being tall. Either way, I've already purchased that same cam to swap out what in the 408 that's in my W150. I have a 5.9 block, Indy X-heads, 9.6:1, Crane 1.6 rockers, Air-Gap, and QF 735-SS. Currently running a Crower 34416 (284/284, 224/224, on a 114 LSA, installed at 110) and it's just too soft down low for me (pulls hard from 2600-6000).
The next size up (Big Mama) is 235/243 and the largest (Big Daddy) is 243/251. Those might be closer to what was recommended to you. Howards recommends installing at 103 CL but, given that you're putting that engine in a Dart with a good converter, I'd look more towards installing at 105 or 106 to kill off some of the low end...unless you just want to fry tires.
