1500USD to build as much horse in a 360 as possible. What would you do?

Well MoPar parts isn't that plentiful on this side of the atlantic and the cheapest headers for the following options -66 Dodge Dart 360 SB on Summit costs 604USD + shipping of 'bout 200...

Wow! How about used headers?.......is it the exchange rate that is making them cost $604? That's crazy!......but there's always an alternative!