well i have a dual exhaust on my 85 ta and wen i had the last motor in my car it always showed 0-5lbs of oil pressure and had no power so i swapped it for a 350 and i ran it straight out of the exhaust manifolds and it ran ok given that the carb is shot and the oil pressure stayed steady at 20-30lbs. well i took it down and had the crossover welded up to fit the manifolds, and the car just ran like crap. the car had no ***** and wen i got back to my garage the oil pressure was showing 0-5lbs. my god the 350 is hauling like the 305 i ripped out