Here is my take on it:
Stock LS engine wiring/PCM
$300-400 for a used harness with PCM
$300-400 to rewire it
$400-500 to have it custom tuned (then keep paying for add'l tunes if you make changes)
Total: $1K-1300
Holley HP EFI
computer with brand new LS engine harness plug/play
Load up a base file map and learn to tweak it yourself
Allows for 2 step launch control, data logging, lean cruise, e85 maps, optional traction control, boost controller, nitrous controller, engine shut down for too high of coolant temps or too low of oil pressure
$1400
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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....
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