I'll echo what others have said-- if I was starting from scratch, I'd go LSX. Big time factory engineering development dollars spent on that engine that no aftermarket manufacturer can match, very efficient cathedral port heads, etc. With the adapter plates for the motor mounts being a dime a dozen, modifed oil pans and headers available from several outfits to drop them into early chassis, it makes the decision a pretty easy one IMO.
Even though I would favor the LSX, if you were going to go aluminum SBC, I'd lean more towards a Dart block. I've seen the World Products / Motown offering, and while a nice piece it's not up to par compared to the Dart pieces when it comes to casting and machining quality. It's not a bad block, but you can do better for just a little bit more.
Troy
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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