I'm building a replacement 5.7 for my 2007 truck. The original engine will be saved for a future build.
I may use the original 5.7 in my other '70 Charger using a 500 or 518. I'll have durability with an overdrive and lockup converter. The .69 overdrive ratio is great compared to the other options out there.
If I recall, the A-500 was used in many vans. You know THOSE were not lightweight. The 2.74 and 1.74 1st and 2nd ratios are better than the 518/727.