Small Block Distributor Recommendation
It will improve efficiency at part and light throttle by better matching the leaner fuel mixes. Less dense mixtures take longer to burn, therefore longer lead helps maximum pressure to arrive at the right time for overall max leverage on the crank.
Based on these goals, and the engine situation, my suggestion is option 2.
Factory distributor with a remote HEI module is a reasonable option. The Chrysler distributor can handle a two stage curve which would be good with an engine like yours. Assuming emissions are not major concern, you can use a shorter but relatively quick first stage and a long slow second stage. (The factory would have been a long but quick primary stage). The HEI module is relatively small (compared to the MSD) and has built in current limiter so ballast resistor is not needed. Of course you could use the 6A, they work fine with any distributor, but that doesn't clean up your fender.
Yes to a 2-stage!
This is what I did; 367,10.9Scr, .034Q, and a Hughes-cam 270/276/110+4 (a
[email protected])and aluminum heads.
That allowed me to run it on 87E10 since 1999 . She runs 14 Initial,20 in the D, plus 22 more in the can. The curve starts at about 1000 and hits 28*Total at 2800, then stage-2 brings in the rest by 3400. I cruised that combo at 85=2100rpm, with all of the Vcan in for a total of about 45*.
I used a dash-mounted, dial-back, timing device to arrive at those numbers. It has a range of 15*. I set it in the middle so it has a range of about +8/-7. Sometimes on long cruises I play with it. The engine has responded well to all 8 being added, for a total of 53*@2100@85mph. That would be 14+9+22+8. After 53* it's hard to tell if she's liking it or not.
With all that advance,and around 185psi cylinder pressure, I leaned the Chit out of the cruise circuit, in the 1850 I was using.
And I won't tell you how Grrrreat the mileage results were.
YR is right about the can being slow to decay. With iron heads it could be a problem.In my case, it wasn't the can that was slow, but rather; I traced the slowness to a soft vacuum line and the tiny hole at the spark-port.I drilled that orifice out a little bigger, and swapped in a new thick-wall vacuum line, problem solved.
But I don't run that cam anymore,It dropped a couple of lobes. So now one size bigger; 276/286/110. This is now a
[email protected]
And I no longer use that double OD trans. I now run 54*@2250@65mph with same D and same curve. And This POS cam drinks gas like you wouldn't believe, and I can't get that 750DP to love me no how,lol.
Happy HotRodding
