Looks good, the straight up positiion is what Edelbrock recommends, as you said. I ran mine in the advanced position the last time I used it, a few guys suggested it, seemed to do OK. I have it in the straight up positiion this time. Glad everything worked out, some have had issues with their Olds Performer timing sets with the dots being off. Glad it is internally balanced, supposed to help bearing life. Piston to wall, most say .004" minimum. Speedpro says .002" in the instructions and .001" on the box😳. They are a heavy piston, keep the rpm reasonable. What bearing clearances were done. My 330 stroker crank supposedly has .0025"/.0025" which is on the tight side, it will get checked. Smitty spec'd those clearances, just before his body, then his mind failed him. Hopefully your heads are all fixed from the J+S fiasco. I hope it runs cool and runs great for you. I chickened out, way too many overheating memories with my 403, the .039" oversize pistons I have would not make it easier to cool. I went the easy Olds 350 route, hopefully will hear any day from the machine shop. Can hardly wait to hear your 403 run👍.