If you're on the fence about a nice pre-64 Model 70 with a 1:9 twist (or an older Rem700 w same).. and you are enamored of the 142 ablr.... and you reallywant that combo to work so you feel good about buying it ... you wil be disappointed. I have been there. I have several of them and the 142 is not happy with any of them. The bullet they like is the 130 Nosler AB.
But you want to shoot the 142...sorry.
Please resign yourself to the fact that 1:9 is not the twist for success.
I, too, was enamored of the 142 but, in the end, I finallyhad a barrel maker cut rifle a barrel with the M70 profile and 1:8 twist and now all is well.
As bad as we may want something to work and challenge the existing logic, it generally doesn't. Lots of us have paid beaucoup tuition for that lesson. In the end, do you want the rifle more than the bullet? I'd go with that fork and honor it with the bullet it is comfortable with. Though the 130 AB doesn't quite have specs, only in very long range situations would the higher BC of the 142 be of critical importance. Maybe that helps you pull the trigger on your opportunity.