We have seen a Ford 427 dropped into an Alpine and I believe all of the inner fenders had to be removed and a tube frame utilized. Looks like you were able to put back modified inner fenders - great job! Should be a monster when done - hope your brother-in-law can keep the car pointed straight ahead when he gets on it - car might be a little squirrelly under full power! Maybe you or your brother can find someone to make some "Liger" scripts for the fenders, like the original Alpine (or Tiger) scripts.
We do like to keep the history of the Tiger accurate, and there were some things in your write-up that are not quite right. We don't want anyone to get the wrong impression.
The Tiger originally came with the Ford 260. Only the last 636 Tigers came with 289s, and that was after Chrysler Corp. bought out Rootes Group (including the Sunbeam line of cars). And Shelby was asked to make the first prototype for Sunbeam after one of the Sunbeam executives in the US saw the Cobra. The Cobra preceded the Tiger. You are right - Chrysler was not happy about selling a car with a Ford engine (the later 260 and all of the 289 Tigers came with Chrysler pentastars on the right front fender) and the Chrysler small block was too big to fit in the engine bay without a bunch of re-engineering, so production ceased in mid 1967.
Thank you very much for sharing your project with us. We will be anxious to see it as it comes along. It is looking GOOD.