I really appreciate all the comments and advice. After reading lots of related posts here, I do understand that the 603 can be noisy.

Right now, I'm not going to change the #14 head unless it gives me a real reason to. But, I am going to follow some advice from Scott who gave me some very detailed things to consider and follow up on. I really don't have a baseline of known maintenance like the chain and injectors.

I really want to change the vacuum pump to avoid a disaster, check for chain stretch and get my injectors balanced then timing

I guess the most helpful things to ask are: Who can I send my injectors with Bosios to get balanced. I live in Colorado but have ties to North Carolina.

And, if changing the vacuum pump is it also the best time to check chain stretch since its pulled.

Thank you all for you input and if you have other thoughts, let her rip.

__________________

1987 300SDL (Grumpy) w/142k
2011 Jeep Grand Cherokee w/ Hemi
1989 420SEL (Sold) Awesome Car
1992 400e (Sold) Rocket