Good luck with the research and the build. There's certainly a lot of experience and good advice here for you. Guess you don't need to make any decision on your own..
Doing it again I would go a 4.6ltr. And a Harrison or the Classic revival after seeing "Aussie Mikes" kit. Both appear well finished and value for money. There are a number of cheaper kits but they do however require some extra work for you...
Cheers