Early A: Dougs D450 vs TTI 636a

I'm thinking on what the best header to go with is:

Dougs D450 or TTI 636A: both are for early A bodies, small block.

Can someone provide info??

!) Best and easiest intall?
2) Source for best price?
3) what to do about the cyl. end studs (2 wet holes) can you keep studs?

4) recomendations?
5) how do they compare? als0; compare to spitfires? Harold still owes me a set, its been 2.5 years....no headers. he kept my money. Always promises them, never delivers. Anyone live next door to him??????