Stupidly, medicine generally advises heart patients against vitamin K (probably because many drugs work to oppose it.)
I think its probably because of its coagulation function, and heart patients usually get aspirin and other blood thinners.
Now, on Weston Price I read that coagulation role is that of K1 while K2 has other roles among others decalcification.
About blood pressure, there are other things that might be in question apart from atheroscleroses and calcification.
For instance inadequate Renin levels. Renin is protein used by the kidney to regulate blood pressure. Vitamin D controls it.
The results of epidemiological and clinical studies suggest an inverse relationship between serum 1,25-dihydroxyvitamin D levels and blood pressure, which may be explained by recent findings that 1,25-dihydroxyvitamin D decreases theexpression of the gene encoding renin (see Function).
Depending on Sun exposure, I would suggest preloading of 50,000 IU/day one week, then dropping slowly to 5000 IU/day till the end of the month. Ofc, blood levels of 25(OH)D should be measured (I didn't took tests yet tho with that supplementation regime) and TSH levels. With that huge amounts of D3 (must be D3), at least 100mcg K2 must be usd to prevent eventual toxicity and calcification and 500mg Magnesium-Citrate. 1mg of Iodine or more (up to 10 mg) might also be added to boost the thyroid gland role in Vitamin D activation.
Niacin can also help. It is potent peripheral vasodilator and the best HDL booster in the world. Amounts from 500mg to 3g. Must be taken with Vitamin C if sustained formula is used to prevent Niacin tolerance. Can have few side effects - flushing and itching.
He should also try Grapeseed extract and Resveratol.
If all that doesn't work I would try Arginine therapy without Pauling ( ~5g/day ) to boost NO.