I agree with everybody above. I am useing FSPP 264D which works exactly as i hoped for. Excellant driveability - nice little lope at idle and when i open up all my carbs it handles it without hesitation. He disagreed with my valve spring selection and told me so and I went with his recomendation. Got headers,valve springs, guides, cam, valve cover and a couple other things there. Anal retentive, osbsessive compulsive, perfectionist machinist that worked my block and head was impressed with quality.