Check out these New Flat Tappet Lifters . I know they are not as good as Roller Lifters . But deliver 20-30% more oil to the Camshaft Lobes 12-16 oz of oil Per Mimute at each Lobe . Slight Drop in oil PSI 1-2 Lbs . Crower make's them for Chevy Ford Pontiac Buick Old's and AMC .

http://www.summitracing.com/parts/CR...2/?image=large