If your spending that sort of money on a reworked old banger then why try and buy one of these rare beastie to drop in the front..
https://www.wheels.ca/news/hellephant-426-1000hp-crate-engine-from-mopar/
The big block Mopar is a large part of an Interceptor's appeal to me, so it has to stay. Improving it to crazy levels is now cheap enough that I'd have to do it. Pete's used 4 Dellortos and a Megaspark ignition which woke up the basic 440 a treat. That $2300 I quoted for the stroker kit is for the entire rotating assembly - crank, rods, bearings, bolts and pistons - and will live with over 1000hp if you think that's necessary in a road car.
A decade ago an old rusty Interceptor could be had for about £10000. Not now.
A decade ago, would you have wanted a rusty old interceptor?
A decade ago £10k would have still just about bought a usable car. Scruffy, but usable. The biggest problem with using such a thing is the thirst, but that applies to anything with similar power - mental turbo four cylinder cars struggle to break 20mpg.
And yes, I've always fancied one although a good XJS would have made for a difficult decision.