Pic says rockers are all adjusted.. Whats up with #7 cyl. Jam nut is almost flush and all the others are 3 or 4 threads down..
I agree with Joe....could be grabbing valves..     Cory

Rory... the 68 is not running a Blaster 2F just a regular blaster mounted vertical. The 66 CJ Mustang I did has a Painless harness in it with a blaster 2F and it came with a resister..I have 17,000 miles on the the 68 with a full 12V running the Duraspark...I have not had a failure yet

Hey Rory...generally use a MSD blaster 2F. It has the correct terminals for the horseshoe clip..If the cars have monte carlo bars I use a standard top Blaster and run the harness inside the monte carlo bar.....Cory

You have be careful with the Blaster coils..MSD wants some of them to be vertical mounted only..

I do have the wiring schematic I got back in the 80's with the Ford SVO duraspark wiring harness. I will dig it out tomorrow and scan it. They do not say anything about a resister. I have had the same blue strain box in my 68 since the mid 80's..Not saying I am right but I have never had a failure in 40 years and I have a huge pile of Duraspark stuff for a reason. I always fire mine of the I terminal on the solenoid.... Cory

I have done countless Duraspark conversions since Ford SVO made the harness in the 80's. I have always run them full 12V and never had a failure. The last one i did on the 66 Mustang Fastback with the 428CJ I got a painless wiring harness.It came with a resistor so i wired it up. Car started fine..This is a ongoing subject with no real answer. I always use blue strain Motorcraft boxes..I have half a dozen FE Duraspark dist..I will continue full 12V till I see a failure..JMO....Cory

I pulled the towers out and cut them all up. Goal was to create engine room.I used my 67 as a template and added a inch. I even managed to keep the big dent in the right side shock tower..My goal was to make it look like Ford has done it...Yes there was a Heidts front end hidden under all it...I also added two torque boxes,frame connectors and a Shelby roll bar..I spent years of spare time on the car. It was for my brother and he refuses to give me any credit for it.That also means I made $2 a hour on the car...Currently working on buying it from him.....Cory....I will add ..some one else started this project and welded the front cross member in 1 1/4 inched to far forward...Guess who had to fix that mess

I agree with Rory...We are still farther ahead that we were 30-40 years ago..When I built my 427 in the late 80's cam selection (solid) was slim. Intake choices were even slimmer.  So i found a C7-F intake .. Header choices were not good so I redrilled the heads and put CJ exhaust manifolds on. There was no ARP we used SPS rod bolts..When I bought my aluminum heads only Edelbrock had them..I bought empty 427 heads and had them built the way I wanted. They have been surpassed but i don't care..I built my engine for torque not HP...Its a street car...It sucks that the venders come and go..My advice is..grab it while you can...Cory