1965 Valiant LS Build

That's all they do. Look at Ford Racing and GMPP for comparison, WAY more support with decent-quality affordable parts for enthusiasts either modifying their cars or swapping older models. GM still makes parts and even crate engines based on the old 350 SBC, Mopar dropped all the SBM/Magnum stuff years ago. Nobody buys crate Hemis at those prices, far more cost-effective to use junkyard and warranty or wrecked pullout engines. I was more against the LS-swapped Mopars up until recently when I realized Dodge/Mopar (Stellantis) doesn't really give a damn about their performance enthusiast customer base except for the ones driving current models. LS also has advantages of being more compact and lighter especially with the aluminum block versions. I still wouldn't do it myself but I understand more now why others would.
I agree completely. This is exactly why I’m LS swapping the car. The LS is such a versatile platform in that almost every part is compatible. It bolts up to all sorts of transmissions, almost any cam from any gen LS is compatible, I could go on and on. This also helps to make everything more affordable, since you don’t have pay for one off parts. And on top of it that, there’s so much more aftermarket support for the LS than any mopar engine. I understand why mopar enthusiasts would want to keep their cars mopar, but from the perspective someone who’s into all sorts of cars the LS is a great option.