I would agree I'm a little uneasy about tapping into the drain plug but it has its advantages in my case I used 10an = 1/2 id to the mech pump then 8an after the pump to the holley 850.
3/8 =1/4 id and 8an = 5/16 ... not much difference and since its such a short distance ? I guess it depends on the pump set up ... the gravity portion or section from the sender to the pump is basically sometimes oversize because its under a small neg pressure so over sizing it helps supply the pump with volume and the outlet side of the pump ... pressuring the fuel could be smaller ...
I agree running the car at its peek ... the weak links start to pop up ... mostly on the street the stock system ... should be fine.
Ron
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