If you look on Corvetteforum you can often find LS7 pullouts for about the same price as a crate LS3. The main issue with the engines is the valve guides can wear prematurely from the factory so the heads should have either had that done... or will need it done. 20% more cubic inches does wonders for power output.... namely torque.
The oiling system can be converted to wetsump via a spacer and different oil pump/pan. Add a bigger cam and MSD Atomic intake/headers/tune and gains of 100rwhp+ are achievable.
That being said I'm ordering a crate 430hp LS3 for a customer as he wants a warranty and gets used to the car.... before going nuts on it
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Project: 1969 Chevelle, alum 5.3, GTS76 turbo, Chiseled Perf A/W intercooler, Holley Dominator EFI, Davis TC, JRi coilovers, 14" brakes, T56 Magnum. CTS-V Recaro seats!
Coffey Fabrication Nashville, TN doing the fabwork! 800rwhp+/25mpg+/9's@150mph goal
https://lateral-g.net/forums/showthread.php4?t=52976
1993 Mazda FD RX-7, built LS7, T56 Magnum, Holley HP, Davis Tech TC, 8.8" 3.73 Cobra IRS diff, DSS axles, Ohlins coilovers, big brakes.
CCW 18x11 front 315/30/18's and 18x12.5 rear on 335/30/18 RA1's,
2850lbs
10.31@137mph 165mph Shift-Sector 1/2 mile speed
441ci AllPro headed motor and 200lb weigh reduction in the works....