I cannot claim any personal knowledge of Bush’s congressional runs in Texas, so I will not challenge your statement if you were there for those campaigns.
Republicans were lukewarm on the pro-life issue in the years immediately after Roe, and I do remember many only taking the position of “state’s rights” and “personal autonomy” (albeit in a more principle way unlike most of today’s pro-aborts). My recollection puts Bush in the pro-abort camp. I do remember Reagan supporters using the issue against Bush in the primary in 1980, and I don’t recall any sort of denial by Bush in regards to this position. I also recall Bush stating his unequivocal pro-life position shortly after he became the vice presidential nominee, and commentators describing it as a change in his position.
In regards to 1980, it is my recollection that Carter had already sold out to the pro-aborts by that time, despite being a born-again evangelical. (This is something Democratic heroes like Jesse Jackson, Al Gore, and Dennis Kucinich would later do.) Am I recalling that incorrectly? Is my whole memory on the elections of that time in my life flawed?