kid5.0

I can get a used set of ported windsor sr heads (iron) for really really cheap, and was wondering if they would work better on my car than my holley systemax 2 heads. What do you guys think? You can definately tell these things have been ported. The previous owner went a 12.8 with these on a low compression 306 (8.1), f cam, and the typhoon intake ported on street tires. Just wondering if these would be worth it, or should I wait and just get my holleys ported? (i already have some holley systemax 2 heads)

here are the ported heads flow numbers (approx) http://www.kendrick-auto.com/dart_wi..._ford_head.htm
Intake Port Test Results
Lift Previous CFM Current CFM % Gain Exhaust/Intake

0.050 38.3 41.1 7.4 71.8
0.100 74.8 79.3 6.0 74.4
0.200 127.1 148.6 16.9 81.0
0.300 175.3 184.2 5.1 78.4
0.400 213.9 237.7 11.1 75.4
0.500 234.7 267.4 13.9 73.0
0.550 243.6 285.9 17.3 70.0
0.600 246.6 294.8 19.5 68.4
0.650 248.1 299.3 20.6 68.4
0.700 249.6 301.5 20.8 67.9
0.750 249.6 301.5 20.8 67.9
Exhaust Port Test Results
Lift Previous CFM Current CFM % Gain Exhaust/Intake

0.050 28.3 29.5 4.3 71.8
0.100 58.1 58.9 1.4 74.4
0.200 115.5 120.4 4.2 81.0
0.300 122.0 144.4 18.4 78.4
0.400 154.1 179.2 16.3 75.4
0.500 168.0 195.2 16.2 73.0
0.550 169.6 200.0 17.9 70.0
0.600 171.2 201.6 17.8 68.4
0.650 171.2 204.8 19.6 67.9
0.700 171.2 204.8 19.6 67.9
0.750 171.2 204.8 19.6 67.9

and here are the stock holleys, which mine are lightly ported on the intake side to match the gasket.

Holley Systemax
Intake Valve Exhaust Valve Int 200 Int 300 Int 400 Int 500 Int 600 Exh 100 Exh 200 Exh 300 Exh 400 Exh 500 Exh 600
1.94 1.6 119 166 202 219 228 57 95 126 152 166 176