I bought a 2005 Ram 1500 with a blown 5.7, did alot of research online to find out the 2003-2009 Hemi factory valve springs were weak, recommended replacing them in higher mileage engines before they drop a valve like this 05 did, I went and bought a reman long block with aftermarket springs,
runs, sounds great with the shorty headers!

86 Daytona - 612/ glide - 2400lbs - 8.60 alot more left
71 S/G Challenger - 469/glide - 2800lbs - 9.20s and tuning
70 Challenger - mild 440/727 - 3475lbs - 10.96 best
70 GTX - future quick 16? more $$$$$$