Even if you bought the SM's and had the VJ fixed, you are going to be in for a decent sized bill with reconditioning J heads with new springs/retainers/etc.
What's the all in cost to run stuff. If it's 700 to run one thing and 850 to do another, not a lot of difference. Spend a couple minutes on each bowl of the SM head and it will make 400+ at sea level with the parts he has and a xe268h type cam.