Headers VS Manifolds

WELL the engine was scoped on a bench and turned like a real 323 HP...pretty impressive BUT certainly not in the 4, 5 & 600 ranges where the experiment says the most can be obtained from headers....it is likely this car will never see a drag strip or be in ANY speed competition. With this one I will be burnin out here & there but that is about it...this is a drive park & shine toy. I ALREADY have a nine second yes 9, blown 340 72 Duster...so obtaining performance is no biggy and not a NEED with the 66.... and I have a crusier a 428 67 Pontiac Bonneville convertible.... this is just another toy ....just wanted to hear your thoughts/ opinions.... The set up is weird and it has all the right equipment, it actually looks quite stunning in the build phases...... I have just never realized the advertised and popular opinion benefits regarding the addition of headers on below 350 hp cars!! I have done many many installations and have yet to feel any significant difference worth the cost or effort required to put them in and maintain them....on the full blown race car YES I get it and I am lookin for 10'ths of seconds there but on the street???? The wrong activity there gets your car impounded, generates insurance coverage loss and hundreds in fines & fee's.....no thanks
It seems to be a somewhat senseless( to me) cost vs benefit arrangement. and I was askin to hear what you all would do with this sweet 66 if you were in my shoes and the money was coming out of your pockets....I hope it keeps going I am loving the ideas and the thoughts behind them



ANYONE know for sure if the all the 273 manifolds were the same? I was wondering if the Commando 273 were any different?