you can build a 454 ci small block with out needing alot of one off parts. the next motor i plan to build will be a 400 sbc bored and stroked to around 454 ci using an aftermarket dart block with splayed 4 bolt mains. the cam is still in the standard location with this way and it accepts all standard sbc parts. of course his will be after i get a degree and a good job waaaaay in the future 
i had read some where that going more than around 450 cubes with a small block is not very advantageous because the external deminsions of a small block head will just not allow for the heads to have large enough ports to flow the needed air
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'51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works
'05 1500 Crew Cab
RIP
'84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker
'80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's
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