Need little Help

May not be possible or practicle but any used engine or trans will be worth way more if the buyer can witness it run/drive. At a minimum I would do a video of car running and driving with parts you're wanting to sell prior to pulling to add much value. Not that your word is bad but not the same as seeing in person or at least video proof to support your claim. As always used parts are as-is but again video will increase buyers confort level therefore the amount willing to risk.