Best bang for the buck?

P4452759 260/268 lift 430/450 and matching springs
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so I looked up your cam and as you can see there's the advertised duration which you quoted me and the real duration at 50%... I don't even see the need for new Springs with this cam..
The problem lies in the low compression of the 318 in it's stock forum... If you went with a new torque converter like people are recommending you would probably be able to step up that cam just a little bit as well. I have more questions though.. what intake manifold? Carburetor? Headers? Dual exhaust? One tire fire or Sure Grip? Rear tire size? And are you spining off the line?..