1972 Demon 340 engine mods

Miszny said
:)

Sooth idle is relative. My car has big block with solid roller cam .640 lift and 285 duration and comparing to this 340 with hydraulic cam it idles super smooth for what it is. I'm realistic.
This 340 shakes all over the place.
I set the lash to zero + 1/4 turn. Ohchit, for some reason I thought you had a solid 284 in there.
Well if the vibration is as bad as you say, I would suspect an engine balance problem.
I will replace all bad electrical stuff that needs fixing and go from there. Will have the parts this week.
I did not check the vacuum but I managed to set it to 850rpm idle and 20 degrees advance. It ran the best this way, also gas pedal reaction became much better without hesitation that it had before.
I will of course check vacuum and report back as soon as it runs again.

I had a 292/508 cam in my balanced 360,(I know not apples to apples), at 11.3Scr,(also with Eddies), and at 14* initial. It hardly shook at at all, just the typical big-cam pulsation, which smoothed right out when given throttle.At 750rpm it idled a tic under 10". I drove that combo with 4 different carbs,at various times.
I'm guessing you have multiple problems

Make sure the power-timing is staying in the ball-park of 32* to 36*.
Those Eddies on my 10.9Scr 360 are quite happy at 14 initial, 28 at 2800,32 at 3400. With 3.55s, and an A833, it will roast the 295s to well past the legal speed limit here, with any cam I have run it with. No specialty ignition,and nearly 50 year old 750DP. My current cam is a Hughes [email protected], and is also set to zero plus 1/4 turn.This just for comparison.