hi all was wondering where i could get a set of performance heads to suit a 2L as i have a 2.6L stroker in my 59 was fitted last week but want bigger heads need to suit a 103mm bore

also where to get some sort of performance exhaust for this same motor

I know SCAT make some aftermarket typeIV heads, as for how good they are on the street, that I'm unsure of.
I've heard that some good original 1700 items are a good starting point, the next step would be to take them to a competent head worker who can flow bench them for you. Just becareful of the exhaust ports, spark plug area cracks and the potential to drop valve seats.

As for exhaust, - BAS in Germany are the best in the buis, again though, I'm sure a good local muffler shop would be more than capable of making a nice custom item for you.

This is the dude you need to talk to about big T4 heads that work.

http://www.aircooledtechnology.com/