Blas Romo De Vivar Y Getrudis Ramires

I am looking for any information on Blas Romo De Vivar and Getrudis Ramirez. I have them married in 1761 with the Parents of Blas being Bartolome Romo De Vivar and Margarita Moran De Ledesma. The Only record of Bartolome is Birth in 1673. Many have used that person to claim as the parent but it doesn't match up with Blas approximate age and date of birth. Does anybody have reasearch on thise person to clear that up?