Universal — using face-replacement technology and the late Paul Walker’s brothers to finish the film — is in a tense negotiation to get reimbursed as the costs soar past $250 million. When Paul Walker was killed in November in the midst of shooting Fast & Furious 7, it was clear the actor’s untimely death could trigger by far the largest insurance claim in Hollywood history. That now appears to be the case as the project is undergoing an effects-packed 13-week shoot that will culminate in July with an enormous crowd scene using 600 people in the town of Rosamond, near Bakersfield, Calif. But according to a source with knowledge of the situation, there is growing tension between Universal Pictures and its insurer, Fireman’s Fund, over the size of a record-smashing claim in the ballpark of $50 million. PHOTOS: Paul Walker’s Career in Pictures The cost of finishing Fast & Furious 7, originally budgeted at $200 million, will be daunting, even though a person with ties to the project says the storyline has not changed drastically.